Evelyn l



(No Model.)

H. L. SMITH & G. O. H. FOSTER.

SOCKET FOR INGANDESOENT LAMPS.

No. 477,786. Patqnted June 28, 1392.

U ITED STATES PATENT OFFICE.

EVELYN L. SMITH AND GEORGE C. H. FOSTER, OF BRIDGEPOR'I, CONNECTI- CUT,ASSIGNORS TO THE CROWN ELECTRIC MANUFACTURING COMPANY, OF SAME PLACE.

SOCKET FoR INCANDESCENT' LAMPS.

SPECIFICATION forming part of Letters Patent No. 477,786, dated June28,1892.

Application filed September '7. 1891; Serial No. 405,006. (No model.)

To all whom it may concern; so asto fit snugly within said slot, wherebyBe it known that we, EVELYN L. SMITH and said screw can have noindependent axial ro- GEORGE C. II. FOSTER, both citizens of the tation.

United States, residing at Bridgeport, in the 11 is the uppercontact-spring, secured dicounty of Fair-field and State of Connecticut,rectly to the bottom of the screw by the 5 5 have invented certain newand useful Irnnut 12, the latter also serving to secure the provementsin Sockets for Incandescent screw in position, as shown at Fig. 3.

Lamps; and we do hereby declare the follow- 13 is the lowercontact-spring, secured to ing to be a full, clear, and exactdescription the binding-post 4.

10 of the invention, such as will enable others 14; is a stem journaledwithin the yoke 5, 6o skilled in the art to which it appertains to and15 a suitable key rigid with said stem, make and use the same. 7 wherebythe latter may be conveniently ma- Our invention relates to certain newand nipulated. On this stem are secured the useful improvements insockets for incandesswitch-cam 16 and rectangular controlling- I 5 centlamps, and has for its objects to simplify block 17. r 5; and cheapenthe construction of such devices, 18 is a flat spring secured to thedisk 2 and to reduce to a minimum the resistance which bearing againstthe block 17, the function of the device itself offers to the electriccurrent, said spring being (as is usual in suchiinand to secure thesocket-screw as against any stances) to prevent the overthrow of thestem 20 independent axial rotation. V at the end of eachquarter-revolution thereof. 70

With these ends in view ourinvention con- The switch-cam 16 comprises askeleton sists in the details of construction and comframe 19, securedto a body 20, which latter bination of elements such as will be hereinisrigid on the stem 14. This frame is made after fully set forth, andspecifically desigfrom thin highly-tempered metal and by its nated bythe claims. resiliency affords a contact With' the springs 7 5 In theaccompanying drawings, Figure 1 is 11 13 far superior to the contactbetween a a side elevation of our improvement; Fig. 2, solid cam andsprings. The yoke 5 is not in a section at the line :0 a: of Fig. 1;Fig. 3, a theelectrical circuit, the body 20 being made section taken ata right angle to the section from any non-conducting material, and theshown at Fig. 2; Fig. 4:, a section similar to current flows directlyfrom the lower contact- Fig. 3, but showing the socket-screw, upperspring to the socket-screw, to which latter the contact spring, andsecuringnut disconupper contact-spring-is secured. In the manected, thelower spring-terminal and the jority of devices of this character theyoke stem and parts carried thereby being omitted; (or pillars, astermed) is in the circuit, and

3 5 and Fig. 5 a section at the line 3 y of Fig. 8. for this reason theresistance ofiered by the Similarnumbers denote like parts in thesevsocket itself to the electro-motive force is so l fi u es great thatthe light is materially lessened 1 2 are the upper and lowerinsulatingthereby. In our improvement the yoke is not disks,respectively. in circuit, but the current flows directly from 4o 3 4 arethe upper and lower terminals, sethe lower terminal to thesocket-screwwitlr o cured to the disks 1 2, respectively, and to out anydeviation, and to these facts we atwhich are Secured the nducting-Wiresin tribute the superior resultselfected by'our the usual manner.improvement. Again, in all'prior devices of 5 is ayoke secured to thedisk 2 by screws this description the socket-screw has caused 5 6 andextending through openings 8 in the a most vexatious trouble, owing tothe fact 5 disk 1, the bridge 7 of said yoke being counthat it has beenimperfectly secured. It is tersunk within the disk 1, so that the latterabsolutely necessary that said screw should is rigidly held as againstrotary movement. have no independent axial rotation, and by 9 is a slotin said bridge, and 10 is the socketutilizing a yoke in our improvement,as here- 50 screw, which is cut away, as shown at Fig. 5, inbefore setforth, we are enabled to secure I00 nal'ed in said yoke, and the camcarried by 9 said stem, substantially as set forth.

2. The combination of the upper insulatin g-disk, the yoke-bridge havinga slot therea in, the socket-screw shank fitted closely within saidslot, the upper contact-spring, and the nut whereby said screw andspring are secured together and to said disk, substantially ias shownand described.

3. The combination of the upper insulating-disk having openings therein,as described, the yoke extending through said openings and having abridge which is countersunk within said disk, the socket-screw extendingthrough said yoke and di'sk, and the nut on the lower end of said screw,whereby said disk is secured between said bridge and nut, substantiallyas shown and described.

In testimony whereof we affix our signatures in presence of twowitnesses.

EVELYN L. SMITH. GEORGE C. H. FOSTER. Witnesses:

F. W. SMITH, J r., J. S. FINCH.

